Instruction: Add new formats 45cc and 4rcc.

These are new 4 byte formats with the following properties.

- The first three (16 bit) words of these instructions have the same
  format as 35c and 3rc respectively.
- The fourth 16 bit word encodes an additional constant index reference.

This change includes placeholder opcodes for invoke-polymorphic and
invoke-polymorphic/range which will be the first dex instructions that
use this new format. In addition to a method_idx that gives the invoked
method, these instructions also provide a proto_idx which gives the
(static) type signature of the call site.

The only reason these are included in this change is because we need
an instruction with a given format to write a unit_test using the Instruction
API.

bug: 30550796
test: make test-art-host

Change-Id: I02612ddee47169757175a8079d82f811f6545945